Evolution of the Placenta in Eutherian Mammals

Abstract We review recent advances in our understanding of placental evolution with particular focus on the interhaemal barrier. It seems likely that the non-invasive, epitheliochorial placentation of living eutherians is a derived state. However, there is disagreement on whether the last common anc...

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Bibliographic Details
Published in:Placenta (Eastbourne) 2007-04, Vol.28 (4), p.259-262
Main Authors: Carter, A.M, Mess, A
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Embryology: invertebrates and vertebrates. Teratology
Evolution, Molecular
Female
Fundamental and applied biological sciences. Psychology
Internal Medicine
Mammals - anatomy & histology
Mammals - genetics
Mammals - physiology
Obstetrics and Gynecology
Phylogeny
Placenta - anatomy & histology
Placenta - physiology
Pregnancy
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Summary:Abstract We review recent advances in our understanding of placental evolution with particular focus on the interhaemal barrier. It seems likely that the non-invasive, epitheliochorial placentation of living eutherians is a derived state. However, there is disagreement on whether the last common ancestor of eutherian mammals had an endotheliochorial placenta or a haemochorial one. Research has been stimulated by improved understanding of the relations between the orders of mammals provided by molecular phylogenetics. In part, the uncertainties arise from doubt about how to root the mammalian tree. Resolution of this issue will require improved taxon sampling in molecular analyses. At the same time, we need to foster research in comparative placentation on relevant taxa, particularly at the ultrastructural level. Only then can we ensure that information available about the placenta is adequate to capitalise on future advances in molecular phylogenetics. Examples are given of recent findings that could benefit cladistic analysis of placental evolution.
ISSN:0143-4004
1532-3102
DOI:10.1016/j.placenta.2006.04.010